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Question

Difficulty: EasyDrilling and Boring Tools

When preparing to install a flat-head wood screw into a workpiece, which tool is used to cut a conical bevel at the top of a pilot hole so the fastener head sits flush with the surface?

  1. A
    Center punch
  2. B
    Spade bit
  3. Countersink bitAnswer
  4. D
    Auger bit

Answer

Countersink bit
A countersink bit has angled cutting edges that form a conical recess at the mouth of a pilot hole, allowing the tapered head of a flat-head screw to seat flush with the surface of the material.

Step-by-Step Solution

1
Identify the primary requirement of the task: producing a conical chamfer at the mouth of a drilled hole to accommodate the angled head of a flat-head fastener.
Determine that a specialized beveling tool is needed rather than a standard through-hole drill bit or marking tool.
Flat-head fasteners require an angled recess matching their head profile to sit flush with the surrounding surface.
2
Select the tool engineered specifically to enlarge the entrance of a pilot hole with a matching conical angle (typically 82° or 90°).
Identify the countersink bit as the appropriate shop tool.
Countersink bits feature conical flutes designed specifically to bevel hole openings for flush screw seating.

Key Concept

Function and application of countersink bits in drilling and fastener installation
Estimated Time:45s
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Topics

Drilling and Boring Tools

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